problem with nfs4 with kerberos

Wed Apr 26 07:51:54 EDT 2006

Hey guys...
I use RHEL4 linux version..
I configure my nfs server for work with kerberos as in this web site..

http://www.citi.umich.edu/projects/nfsv4/linux/krb5-setup.html

after that when i try to run command "mount -t nfs4 -o sec=krb5
192.168.5.66:/media/ /mnt/"
it this give this message.. "mount: can't get address for main.mnetplus.lk"

whats is the reason for that..